struct input
{
float4 position : POSITION;
float2 uv : TEXCOORD0;
float4 copyposition : TEXCOORD1;
float3 normsunpos : TEXCOORD2;
float4 sunpos : TEXCOORD3;
float4 moonpos : TEXCOORD5;
float4 projpos : TEXCOORD4;
};
struct output
{
float4 color : COLOR;
};
output pixelfunction( input IN , uniform sampler2D gradient1: TEXUNIT0
, uniform sampler2D gradient2: TEXUNIT1
, uniform sampler2D suntexture: TEXUNIT2
, uniform sampler2D sungradient: TEXUNIT3
, uniform sampler2D moontexture: TEXUNIT4
, uniform sampler2D moonmasktexture: TEXUNIT5
, uniform sampler2D moonhalotexture: TEXUNIT6
, uniform sampler2D starfieldtexture: TEXUNIT7
, uniform sampler2D cloudfieldtexture: TEXUNIT8
, uniform float moonsunangle
, uniform float atmosthickness
, uniform float skyscroll
, uniform float lightstrength
, uniform float clouds
, uniform float stars
)
{
output OUT;
float aspect = 1080.0f/1920.0f;
float2 suninscreen = IN.sunpos.xy / IN.sunpos.w;
float2 pixinscreen = IN.projpos.xy / IN.projpos.w;
float2 sunuv = ((suninscreen - pixinscreen) * 4) + float2(0.5,0.45 / aspect);
sunuv.y *= aspect;
float2 pixelheight = float2(IN.copyposition.y,0);
float gradientsclr = dot(IN.copyposition.xyz,IN.normsunpos.xyz);
float3 suncolor = tex2D(suntexture,sunuv) * (tex2D(sungradient,pixelheight * atmosthickness) * gradientsclr);
float2 mooninscreen = IN.moonpos.xy / IN.moonpos.w;
float2 moonuv = ((mooninscreen - pixinscreen) * 4) + float2(0.5,0.5 / aspect);
moonuv.y *= aspect;
float3 moonmaskcolor = clamp(tex2D(moonmasktexture,moonuv) - moonsunangle,0,1);
float3 moonhalocolor = tex2D(moonhalotexture,moonuv) * clamp(1-IN.normsunpos.y,0,1);
float3 mooncolor = tex2D(moontexture,moonuv) * moonmaskcolor * tex2D(sungradient,pixelheight);
float2 skyuv = float2(IN.copyposition.y * atmosthickness,0);
float3 skycolor = clamp(lerp(tex2D( gradient2, skyuv ),tex2D( gradient1, skyuv ),abs(IN.normsunpos.y * atmosthickness)) * clamp(IN.normsunpos.y * atmosthickness,0.025,1),0,1);
float redcorrectscalar = clamp(1.0f-dot((IN.copyposition.xyz),IN.normsunpos.xyz),0,1);
float3 redcorrectcolor = ((float3( 1, 0.59, 0.16 ) * 0.90f * redcorrectscalar)) * (1-clamp(IN.normsunpos.y * atmosthickness,0.0,1)) * clamp(IN.normsunpos.y * atmosthickness,0.0,1);
float3 starcolor = tex2D(starfieldtexture,IN.uv + float2(skyscroll * 0.1,0) ) * clamp(abs(IN.normsunpos.y),0,1) * redcorrectscalar;
if(IN.normsunpos.y > 0)starcolor = float3(0,0,0);
if(stars == 0)starcolor = float3(0,0,0);
float4 cloudcolor = tex2D(cloudfieldtexture,IN.uv + float2(skyscroll * 0.2,-skyscroll * 0.1));
cloudcolor.rgb += (tex2D(sungradient,pixelheight * atmosthickness))* (1-abs(IN.normsunpos.y));
cloudcolor.rgb *= clamp(IN.normsunpos.y,0.025,1);
cloudcolor.a *= clouds;
if(IN.sunpos.z < 0) suncolor = float3(0,0,0);
if(IN.moonpos.z < 0) mooncolor = float3(0,0,0);
float3 correctedcolor = (skycolor - clamp(redcorrectcolor,0,1));
correctedcolor = clamp(correctedcolor,0,1);
OUT.color.rgb = lerp((correctedcolor) + suncolor + mooncolor + starcolor,cloudcolor.rgb,cloudcolor.a);
OUT.color.rgb *= lightstrength;
return OUT;
}
